JP2001003763A - Sound insulation cover for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably block an outflow of oil from an oil injection part to the upper surface of an engine body and to prevent the generation of contamination of an engine part, white smoke, and a malodor due to an outflow of oil. SOLUTION: This sound insulation cover is formed such that a spacer 12 formed of a solid-form rubber material is mounted in a sound insulation cover body 11 with which a locker cover 10 is covered. A thin flange 20 decreased in an elastic deformation amount against a compression load is formed at the peripheral edge of the communication hole 18 of the spacer 12 and a flange 20 is nipped between the upper surface of a locker cover 10 and the lower end face of an annular flange 15 suspending from the inner periphery of the opening of the sound insulation cover body 11. The peripheral area of the oil injection port 14 of the locker cover 10 is reliably closed by the thin flange 20 part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulating cover for an engine for preventing noise generated by resonance in an internal space of a sound insulating cover attached to an engine body, that is, a standing wave.

[0002]

2. Description of the Related Art As shown in FIG. 4 (a rocker cover is indicated by reference numeral 1 in FIG. 4), an external transmission of engine noise is prevented on the upper part of a rocker cover or the like constituting an engine body for the purpose of aesthetics. The sound insulation cover main body 2 made of resin is attached. A space 3 is formed between the sound insulation cover main body 2 and the rocker cover 1, and a sound wave having a wavelength corresponding to a gap dimension of the space 3, that is, a standing wave, is generated. Resonates and generates harsh noise.
For this reason, usually, a spacer 4 for preventing standing wave generation made of foamed urethane is attached to the back surface of the sound insulation cover main body 2,
The generation of the noise is prevented by filling the space 3 with the spacer 4.

[0003]

However, in the conventional spacer 4 for preventing the standing wave from being generated, the noise caused by the standing wave corresponding to the filled space can be prevented. Oil inlet (not shown)
Near the oil injection port, the oil leaked to the vicinity of the oil injection port flows out along the upper surface of the rocker cover 1,
The spilled oil adheres to parts of the engine main body and contaminates the parts, and the heat of the engine causes generation of white smoke, an unusual odor, and the like.

As a countermeasure against this, a spacer made of urethane foam material is completely filled in the gap 5 between the sound insulation cover main body 2 and the rocker cover 1 so that leaked oil does not flow along the upper surface of the rocker cover 1. Even if it does, the deterioration of the urethane material due to the oil leaked at the time of injection and the outflow of oil through the communicating bubbles occur as the progress proceeds, and the same problem as described above occurs.

In order to solve the above problem, when a solid rubber material such as acrylic rubber or nitrile rubber is used,
Although the problem caused by the foam material is eliminated, it is impossible to maintain the seal over the front surface of the spacer, and as a result, the oil leaking through the formed gap moves, causing the same problem as described above.

Therefore, the present invention can reliably prevent oil from flowing out from the vicinity of the oil injection portion to the upper surface of the engine body even if a spacer made of a solid rubber material is used, and furthermore, the generation of standing waves. It is an object of the present invention to provide a sound insulating cover for an engine that can prevent noise.

[0007]

Means for Solving the Problems As means for solving the above-mentioned problems, the present invention relates to a sound insulating cover body having an opening at a position corresponding to an oil inlet of an engine body, and an inner surface of the cover body. And a standing wave generation preventing spacer provided with a communication hole at a position corresponding to the opening, wherein an annular flange hanging down from an inner periphery thereof is formed at an opening of the cover body. In addition, the spacer is formed of a solid rubber material, and a thin annular flange is formed on the inner periphery of the lower end of the communication hole provided in the spacer, and the flange is connected to the lower end surface of the flange of the sound insulation cover main body and the engine main body. It was sandwiched between the upper surface.

In the present invention, even when a solid rubber material is used as the spacer, a thin flange portion having a small amount of elastic deformation is sandwiched between the engine body and the flange formed on the peripheral portion of the opening of the sound insulating cover. Therefore, the spacer is appropriately deformed and the seal is reliably maintained.

[0009]

FIG. 1 shows an embodiment of the present invention.
This will be described with reference to FIG.

In the drawings, reference numeral 10 denotes a locker cover of the engine body, and reference numeral 11 denotes the locker cover 10.
A sound insulation cover body 12 of a resin sound insulation cover which is attached to the upper surface of the sound insulation cover by bolting or the like is bonded to a lower surface of the sound insulation cover body 11 to prevent standing wave from being attached by a bush / nut or other means. Is a spacer for

A plurality of ridges 13 for improving rigidity are formed on the upper surface of the rocker cover 10 along the longitudinal direction, and a circular recess is formed so as to divide the ridge 13 in the longitudinal direction. Have been. The recess has an inclined surface at the periphery and a flat surface at the center, and an oil inlet 14 for injecting lubricating oil into the engine is formed on the flat surface. The oil outlet 14 is cylindrical and has a thread formed on the inner surface, and a cap (not shown) is screwed through the thread.

An annular flange 15 is provided at a position of the sound insulation cover main body 11 corresponding to the oil inlet 14 of the rocker cover 10 and extends downward in a tapered manner.
An end face of the flange 15 is an opening 16 corresponding to the oil inlet 14 of the rocker cover 10. And
The opening 16 of the sound insulating cover 11 is
Is formed to be slightly larger than the injection port 14 of the sound insulation cover main body 11.
Has the same angle as the inclination of. At the lower end of the distal end of the flange 15, a concave portion 17 is formed along the concave and convex shape of the upper surface of a bent portion 21 of the spacer 12 described later.

On the other hand, the standing wave spacer 12 according to the present invention
Are connected to positions corresponding to the oil inlet 14 and the opening 16 of the rocker cover 10 and the sound insulation cover main body 11, respectively, so that the inner periphery thereof forms a slope that is tapered along the tapered outer surface of the sound insulation cover body 11. The hole 18 is formed, and the lower surface has a shape exactly following the upper shape of the rocker cover 10.
That is, the rocker cover 10 is formed in a shape including the groove 19 that exactly matches the ridge 13. The spacer 12 is made of a solid rubber material such as acrylic rubber or NBR. Therefore, the spacer 12 does not suck engine oil and is resistant to oil deterioration.

Further, a thin flange 20 having a smaller thickness than that of a general portion is provided at an inner peripheral edge of a lower end of the communication hole 18 of the spacer 12, and a projection of the rocker cover 10 is provided on the thin flange 20. A bent portion 21 is provided along the uneven shape of the ridge 13. The thin flange 20 is overlapped on the outer peripheral portion of the recess of the rocker cover 10, and the lower end surface of the flange 15 of the sound insulation cover main body 11 is overlapped on the upper surface of the flange 20. When the sound insulation cover main body 11 is bolted to the rocker cover 10, the thin flange 20 is used to secure the flange 15 of the sound insulation cover main body 11.
The rocker cover 10 is sandwiched and fixed between the periphery of the oil inlet 14. At this time, the bent portion 21 of the thin-walled flange 20 is
7 and the ridge 13 of the rocker cover 10 are fitted in close contact with each other. The inner periphery of the thin flange 20 is an inclined surface, and a continuous connection is made between the inclined surface of the recess of the rocker cover 10 and the tapered inclined surface of the sound insulation cover main body 11.

With the above configuration, standing waves generated in the sound insulating cover main body 11 are suppressed by the spacers 12, and, in particular, the vertical edges of the communication holes 18 of the spacers 12 A thin flange 20 having a small amount of elastic deformation is formed.
0 is sandwiched between the upper surface of the rocker cover 10 and the lower end of the flange of the sound insulating cover main body 11, so that the thin flange 20 is formed between the oil inlet 14 of the rocker cover 10 and the opening 16 of the sound insulating cover main body 11. It is pressed against the peripheral area with a large pressing load. Therefore, the area around the oil inlet 14 and the opening 16 is
2 reliably prevents oil from flowing out along the upper surface of the rocker cover 10. In addition, since the solid rubber material is used as the material of the spacer 12, no oil is sucked and no corrosion occurs, so that the initial state is maintained for a long time.

In the above embodiment, the flange of the sound insulation cover body, the inner peripheral surface of the thin flange of the spacer, and the inner peripheral surface of the recess of the rocker cover are all inclined surfaces. A vertical surface may be used instead of an inclined surface. Also, a horizontal annular flange may be formed on the inner periphery of the lower end portion of the sound insulation cover main body.

Further, in the above embodiment, the upper surface of the spacer is formed in the same shape as the inner surface of the sound insulation cover main body, and the lower surface is formed in the same shape as the upper surface of the rocker cover (engine main body). If so, a void may be formed on the entire surface or a part between the spacer and the sound insulation cover main body or the rocker cover (engine main body).

Further, the embodiments of the present invention are not limited to those described above. For example, the application site of the spacer according to the present invention is not limited to the sound insulation cover of the rocker cover, but may be other portions of the engine body. It may be a sound insulating cover that is attached to the vehicle.

[0019]

As described above, according to the present invention, in a sound insulating cover for an engine in which a spacer for preventing standing waves is disposed on the inner surface of the sound insulating cover, a solid rubber material is used as the spacer, A thin annular flange is formed at the lower peripheral edge of the communication hole, and is sandwiched between the lower surface of the flange formed at the peripheral portion of the opening of the sound insulation cover main body and the upper surface of the engine main body to suck in the leaked oil. In addition to preventing corrosion, the seal is kept with a thin flange that properly acts on the pressing force, so that noise due to standing waves is reliably generated without generating white smoke or off-flavors etc. Can be prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the same embodiment.

FIG. 3 is an exemplary sectional view taken along the line AA of FIG. 2 showing the embodiment;

FIG. 4 is a perspective view showing a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Rocker cover (engine main body) 11 ... Sound insulation cover main body 12 ... Spacer 14 ... Oil injection port 16 ... Opening 18 ... Communication hole 20 ... Thin flange

Claims (1)

[Claims] 1. A sound insulation cover body having an opening at a position corresponding to an oil inlet of an engine body, and a stationary body disposed at an inner surface of the cover body and having a communication hole at a position corresponding to the opening. In an engine sound insulation cover comprising a wave generation preventing spacer, an annular flange hanging down from an inner periphery thereof is formed at an opening of the cover body,
The spacer is formed of a solid rubber material, a thin annular flange is formed on the inner periphery of the lower end of the communication hole provided in the spacer, and the flange is formed between the lower end surface of the flange of the sound insulation cover main body and the upper surface of the engine main body. A sound-insulating cover for an engine, which is sandwiched between.